Manufacturing variations inherent in the electronic components that make up your circuits can greatly affect their function and performance. These manufacturing variations are generally expressed as tolerances on key specifications of the components and it is not usually possible or practical to manually test a circuit to the complete range of tolerances of all the components.
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In most cases, a VDC output power supply is a simple AC-to-DC converter that has a power supply voltage of 110 or 220 VAC, which it converts into VDC.
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